Timbren Suspension Enhancement Systems (SES Kits) are designed to enhance the suspension of your vehicle.

The softer ride quality of today's trucks and the mediocre
suspensions found on most trailers can cause excessive trailer sway,
instability and suspension settling. Timbren Suspension Enhancement
Systems are mounted between the truck chassis and the axle. They work in
conjunction with the existing suspension to improve the ride of the
vehicle and to protect the springs against overloading, road shocks,
bottoming out, sway and spring failure.